Portion of floor cleaning machine



FIG. 1 is a perspective view of a first embodiment of a portion of floor cleaning machine which embodies our design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view,

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a side perspective view of a second embodiment thereof;

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a rear view of FIG. 7;

FIG. 10 is a left side view of FIG. 7;

FIG. 11 is a right side view of FIG. 7; and,

FIG. 12 is a top view of FIG. 7.

Portions of the portion of floor cleaning machine shown in broken lines form no part of the claimed design. 

The ornamental design for a portion of floor cleaning machine, as shown and described. 